Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Bang-Ji Wang0
Date of Patent
August 3, 2010
0Patent Application Number
117785620
Date Filed
July 16, 2007
0Patent Primary Examiner
Patent abstract
Methods for cooling an illumination device are disclosed. The illumination device comprises a cathode, an anode and a cooling fan. A variation of a lamp voltage of the illumination device is first detected. The lamp voltage is the voltage difference between the cathode and the anode, and the variation of the lamp voltage is derived from comparing the lamp voltage which is detected with the lamp voltage at the first time the illumination device is used. A rotational rate of the cooling fan is then adjusted according to the variation of the lamp voltage.
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